After the break up of the Soviet Union in the 90s, the problem of street children in Ukraine began to grow. Pastor Gennadiy Mokhnenko started taking them off the streets in the now devastated city of Mariupol and adopting them. The 56 year-old is now father to over 40 kids, serves as a military chaplain on the frontline and continues to adopt throughout the war.

Matthew Syed asks whether it’s possible to truly love so many children. He hears from a biologist about the scientific limits of love and an anthropologist about the unique ways in which humans can grow and flex their love, almost like a muscle. He also delves into his mother’s deeply personal experience of raising a non-biological child, relates expert analysis to her complex emotions and questions whether human beings really do have the capacity for limitless love.

With Ukrainian pastor and military chaplain Gennadiy Mokhnenko, anthropologist and author Dr Anna Machin, biologist Dr Liat Yakir and Matthew’s mum, Dilys Syed.

Presenter: Matthew Syed Producer: Vishva Samani Editor: Georgia Moodie Sound Design and Mix: Daniel Kempson Theme music by Ioana Selaru A Novel production for BBC Radio 4